With approximately 50 percent of the U.S. dog population composed of mixed breeds, it's a question many dog lovers hear. In the past, guesses at the breed mix were based on appearance and temperament, but now DNA testing can unlock the mystery of a dog's genetic heritage.

With approximately 50 percent of the U.S. dog population composed of mixed breeds, it's a question many dog lovers hear. In the past, guesses at the breed mix were based on appearance and temperament, but now DNA testing can unlock the mystery of a dog's genetic heritage.

Reading assistance dog programs are popping up at libraries, schools and nonprofit organizations. Both organizers and participants say the literacy dogs are making a significant difference in the lives of children.

Reading assistance dog programs are popping up at libraries, schools and nonprofit organizations. Both organizers and participants say the literacy dogs are making a significant difference in the lives of children.

The United States Postal Service reports that thousands of urban and rural mail carriers are bitten each year by dogs. It's such a serious problem that the U.S. Postal Service helps spread the word about National Dog Bite Prevention week every year.

Certain territorial dogs are very disturbed by mail carriers. Think about it from your dog's perspective: An individual shows up daily, so he or she means business and poses a potential threat. The carrier often comes right to the door. The carrier may even slide scary objects through the door, invading your dog's space.

Some dogs even become conditioned that their bark helps to ward off the carrier. Each day the mail delivery person comes, your dog barks and the carrier leaves. To the dog, that means its loud technique is working. Better socialization of your pet, such as through training classes, can improve its behavior around all people, including your dutiful mail carrier.

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